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The concept Key is a unique identifier for something in some sort of table. In general, they can be only created by the table and are returned when a appropriate new_foo() method is called on the table. There are two classes of values for a Key, valid and invalid. The latter cannot refer to something in a table. Use the method is_valid() to differentiate.
| Key a; | |
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The default constructor is guaranteed to construct an invalid key (i.e. one which is false when cast to a bool.
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| bool | a.is_valid () const | This method returns false if the key was created using the default constructor or was otherwise created to be invalid. |
| std::ostream& | std::ostream& << Event | |
Kinetic::Simulator::Event_key, Kinetic::Active_objects_vector<Object>::Key.